An elaborate Jitter example, JitterLisp, has evolved into an
interesting sub-project in its own right. I am currently developing it in
the
jitterlisp
branch on git, to be heavily rebased before merging into master.

[This is a good place to start]
I presented Jitter in public for the first time at the 2017 edition of
the GNU Hackers' Meeting, in Germany;
the
GHM 2017 page
on
audio-video.gnu.org
contains, among the others, a video recording of my talk. The talk is
still relevant as of February 2018 and works well as an introduction,
but be warned that as the project matures and gets richer some details
will change, gradually drifting away from the state of the software at
the time of the GHM.

[This is a good place to start]
The
presentation
slides
(PDF, 1MB) for the GHM 2017 talk have seen some updates already and I
might further update them to reflect what changed in Jitter, in the
event of future presentations.

The example C interpreters from my GHM presentation and the other files
published in that occasion have been moved to
a new subdirectory,
to which the URL from the slides now redirects.